Here is the entire content (tpehg_db.zip) of the TPEHG DB reformated to .txt files (.dat -> .txt files using rdsamp of the wfdb, and .hea files) for brief download.

The TPEHG DB was developed in 2008 in the scope of a research project financed
by the Slovenian Research Agency [ARRS]. Project: P3-0124 Metabolic and inborn factors of
reproductive health, birth (from 2005-2008, and from 2008-1013, and from 2013-2020).

The Electrohysterogram records (uterine EMG records) included in the
Term-Preterm ElectroHysteroGram DataBase (TPEHG DB) were obtained from 1997 to
2005 at the University Medical Centre Ljubljana, Department of Obstetrics and
Gynecology. The records were obtained during regular check-ups either around
the 22nd week of gestation or around the 32nd week of gestation. The women
participating in the study represented a sample of the general
population. In all, almost 1300 records were obtained during these years, and
a preliminary database was built and used for studies by Ivan Verdenik,
Gorazd Kavšek, Marjan Pajntar and Živa Novak-Antolič
[1],[2].

The TPEHG DB posted here contains 300 uterine EMG records from 300 pregnancies
(one record per pregnancy) carefully selected from the original database of
which:

262 records were obtained during pregnancies where delivery was on term
(duration of gestation at delivery > 37 weeks):

143 records were obtained before the 26th week of gestation and

119 were obtained later during pregnancy, during or after the 26th
week of gestation;

During the selection of records, all records with apparent recording
artifacts,all records from pregnancies where labor was induced, and all
records where delivery was performed using a Cesarean section, were rejected.

Each record is composed of three channels, recorded from 4 electrodes:

the first electrode (E1) was placed 3.5 cm to the left and 3.5 cm
above the navel;

the second electrode (E2) was placed 3.5 cm to the right and 3.5 cm
above the navel;

the third electrode (E3) was placed 3.5 cm to the right and 3.5 cm
below the navel;

the fourth electrode (E4) was placed 3.5 cm to the left and 3.5 cm
below the navel.

The differences in the electrical potentials of the electrodes were recorded,
producing 3 channels:

S1 = E2–E1 (first channel);

S2 = E2–E3 (second channel);

S3 = E4–E3 (third channel).

The individual records are 30 minutes in duration. Each signal has been
digitized at 20 samples per second per channel with 16-bit resolution over a
range of ±2.5 millivolts.

Each signal was digitally filtered using 3 different 4-pole digital
Butterworth filters with a double-pass filtering scheme. The band-pass
cut-off frequencies were:

from 0.08Hz to 4Hz;

from 0.3Hz to 3Hz;

from 0.3Hz to 4Hz.

The records in the database contain both the original and filtered signals.
The records are in WFDB format. Each record consists of two files, a header
file (.hea) containing information regarding the record and the data file
(.dat) containing signal data.

The comment section in the header files (.hea) includes clinical information,
such as:

record number;

pregnancy duration;

gestation duration at the time of recording;

maternal age;

number of previous deliveries (parity);

previous abortions;

weight at the time of recording;

hypertension;

diabetes;

placental position;

bleeding first trimester;

bleeding second trimester;

funneling;

smoker.

The signal data in the data files (.dat) are in the following order:

first channel, unfiltered (S1);

first channel, (S1) filtered using a 4-pole band-pass Butterworth
filter from 0.08Hz to 4Hz;

first channel, (S1) filtered using a 4-pole band-pass Butterworth
filter from 0.3Hz to 3Hz;

first channel, (S1) filtered using a 4-pole band-pass Butterworth
filter from 0.3Hz to 4Hz;

second channel, unfiltered (S2);

second channel, (S2) filtered using a 4-pole band-pass Butterworth
filter from 0.08Hz to 4Hz;

second channel, (S2) filtered using a 4-pole band-pass Butterworth
filter from 0.3Hz to 3Hz;

second channel, (S2) filtered using a 4-pole band-pass Butterworth
filter from 0.3Hz to 4Hz;

third channel, unfiltered (S3);

third channel, (S3) filtered using a 4-pole band-pass Butterworth
filter from 0.08Hz to 4Hz;

third channel, (S3) filtered using a 4-pole band-pass Butterworth
filter from 0.3Hz to 3Hz;

third channel, (S3) filtered using a 4-pole band-pass Butterworth
filter from 0.3Hz to 4Hz.

When using filtered channels, note that the first and last 180 seconds of the
signals should be ignored since these intervals contain transient effects of
the filters.

An accompanying file (tpehgdb.smr) summarizes clinical information of each
record, describing whether the corresponding pregnancy ended on term
(> 37 weeks) or prematurely (≤ 37 weeks), and whether the record was
obtained before the 26th week of gestation or during or after the 26th week
of gestation.

The columns in the tpehgdb.smr file represent:

Record - the name of the record;

Gestation - pregnancy duration (in weeks);

Rec. time - gestation duration at the time of recording (in weeks);

Group - record group according to gestation duration at the time of
recording (<26 weeks, >=26 weeks) and pregnancy duration
(PRE: pre-term, TERM: term);

Early - true (t), if the record was obtained before the 26th week of
gestation; false (f), otherwise.

The TPEHG DB as posted here was the database used during a study of separating
uterine EMG records of term and pre-term delivery groups using various linear
and non-linear signal processing techniques [3]. Please
cite reference [3] if using the records of the TPEHG.

During a study on comparison of various linear and non-linear
signal processing techniques to separate uterine EMG records of term and
pre-term delivery groups [3], among the other, following
non-linear signal processing techniques to calculate following features for
the records were used:

The root mean square value for each filtered signal;

The median frequency for the power spectrum of each filtered
signal;

The peak frequency for the power spectrum of each filtered signal;

The sample entropy for each signal.

The feature values for all filtered signals of the records of the
database are included in the feature values files (.fvl) of the
database. For further details on how the features were calculated, see
[3].

The .fvl files are organised according to the filter used:

tpehgdb_features__filter_0.08_Hz-4.0_Hz.fvl - the features as
calculated using the filter from 0.08Hz to 4Hz;

tpehgdb_features__filter_0.3_Hz-3.0_Hz.fvl - the features as
calculated using the filter from 0.3Hz to 3Hz;

tpehgdb_features__filter_0.3_Hz-4.0_Hz.fvl - the features as
calculated using the filter from 0.3Hz to 4Hz.

The columns in the .fvl files represent:

Record - the name of the record;

Chann - the channel number (1, 2 or 3);

Gestation - pregnancy duration (in weeks);

Rec. time - gestation duration at the time of recording
(in weeks);

Group - record group according to gestation duration at the time of
recording (<26 weeks, (>=26 weeks) and pregnancy duration (PRE:
pre-term, TERM: term);

RMS - the root mean square value of the signal;

Fmed - the median frequency of the power spectrum;

Fpeak - the peak frequency of the power spectrum;

Samp. en. - the sample entropy of the signal, calculated at m=3 and
r=0.15 (see [3]);